#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a;
	cin>>a;
	for (int i=1;i<=a;i++)
	{
		int b;
		cin>>b;
		int j;
		for (j=0;j*j*j*j<=b;j++)
		continue;
		
		if (j*j*j*j==b)
		cout<<j;
		else
		cout<<-1;
		cout<<endl;	
	}	
}